Mitsubishi Electric MR-J4-TM Instruction Manual page 59

1. FUNCTIONS AND CONFIGURATION
(2) Removal of network module
Fixing screw
(6-lobe screw)
5 mm
Hook the slot
cover on the
loosened screws.
1 - 42
1) Loosen two screws fixing the network module
approximately 5 mm using the #8 6-lobe driver.
2) Hook the slot cover included at product shipment on the
loosened screws as shown in the diagram.
3) Hold the slot cover, and pull it straight toward you to
remove the network module.
4) Fit the slot cover to prevent dust from entering it.